Kate Bosworth is a Bikini Babe

British beau James Rousseau joins Kate Bosworth on a Hawaiian getaway with her group of girlfriends on Saturday.

The shady couple held each other in their arms, wading in the water together and cuddling up a storm.

Kate, 24, wore an interestingly shaped bikini top and James, 25, sported a pair of Quicksilver board shorts.

20+ pictures inside of bikini-clad Kate and shirtless James…